Provided is a laminated tube (2) provided with: a first layer (21) obtained from a tungsten-containing first material; a second layer (22), which is formed on the outer circumferential surface of the first layer and is obtained from a second material having the property that transformation accompanied by expansion does not occur when cooled from a temperature that is at least 1000°C higher than the melting point to 25°C; and a third layer (23), which is formed on the outer circumferential surface of the second layer and is obtained from a third material having the property that transformation accompanied by expansion can occur when cooled from a temperature that is at least 1000°C higher than the melting point to 25°C.